/* ============================================================
   SIGNA — app.css · app shell layout (app.html)
   Desktop: sidebar | canvas | Siggy panel
   Tablet:  icon sidebar | canvas (Siggy floats)
   Mobile:  full canvas + bottom nav
   ============================================================ */
html, body { height: 100%; }
body.app-body { overflow: hidden; }

.app-shell { display: grid; grid-template-rows: var(--topbar-h) 1fr; height: 100dvh; }
.app-main { display: grid; grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--siggy-w); min-height: 0; }
.app-shell.no-siggy .app-main { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
.app-shell.no-siggy .siggy-panel, .app-shell.no-siggy .siggy-bubble { display: none; }

/* ---------- Topbar ---------- */
.topbar {
  display: flex; align-items: center; gap: var(--space-4);
  padding: 0 var(--space-4);
  background: var(--surface); border-bottom: 1px solid var(--border);
  z-index: 60;
}
.topbar__nav { display: flex; gap: 4px; margin: 0 auto; }
.topbar__nav a {
  padding: 9px 16px; border-radius: var(--radius-full);
  color: var(--text-secondary); font-weight: 600; font-size: 14px;
  transition: background var(--dur), color var(--dur);
}
.topbar__nav a:hover { background: var(--surface-elevated); color: var(--text-primary); text-decoration: none; }
.topbar__nav a.is-active { background: var(--accent-soft); color: var(--accent); }
html[data-theme="light"] .topbar__nav a.is-active { color: var(--accent); }
.topbar__right { display: flex; align-items: center; gap: var(--space-3); margin-left: auto; }
.topbar__nav + .topbar__right { margin-left: 0; }

/* ---------- Sidebar ---------- */
.sidebar {
  border-right: 1px solid var(--border); background: var(--surface);
  display: flex; flex-direction: column; min-height: 0;
}
.sidebar__nav { padding: var(--space-3); display: grid; gap: 2px; }
.nav-item {
  display: flex; align-items: center; gap: 11px; width: 100%;
  padding: 11px 12px; border-radius: var(--radius-md);
  color: var(--text-secondary); font-weight: 500; font-size: 15px; text-align: left;
  transition: background var(--dur), color var(--dur); min-height: 46px;
}
.nav-item svg { width: 20px; height: 20px; flex: none; }
.nav-item:hover { background: var(--surface-elevated); color: var(--text-primary); text-decoration: none; }
.nav-item.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
html[data-theme="light"] .nav-item.is-active { color: var(--accent); }
.sidebar__scroll { overflow-y: auto; flex: 1; padding: 0 var(--space-3) var(--space-3); display: grid; gap: var(--space-4); align-content: start; }
.sidebar__section-title { padding: 10px 12px 6px; }
.sign-list { display: grid; }
.sign-list .list-row { padding: 7px 12px; font-size: 14px; }
.sign-list .glyph { font-family: var(--font-mono); font-weight: 700; min-width: 26px; }
.sign-list .score { margin-left: auto; font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); }
.sidebar__streak { margin: var(--space-3); margin-top: 0; padding: var(--space-4); background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); }

/* ---------- Main canvas ---------- */
.main-canvas { overflow-y: auto; min-width: 0; scroll-padding: var(--space-4); }
.main-inner { max-width: var(--content-max); margin: 0 auto; padding: var(--space-6); }

/* ---------- Siggy panel (right, desktop) ---------- */
.siggy-panel {
  border-left: 1px solid var(--border); background: var(--surface);
  padding: var(--space-6) var(--space-4);
  display: flex; flex-direction: column; align-items: center; gap: var(--space-4);
  overflow-y: auto;
}
.siggy-panel__card { width: 100%; background: var(--surface-elevated); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--space-4); }
.siggy-panel .siggy-mini-stats { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-3); width: 100%; }

/* ---------- Siggy bubble (tablet/mobile) ---------- */
.siggy-bubble {
  position: fixed; right: 14px; bottom: calc(var(--bottomnav-h) + 14px); z-index: 90;
  display: none; align-items: flex-end; gap: 10px;
}
.siggy-bubble__btn {
  width: 64px; height: 64px; border-radius: 50%; flex: none;
  background: var(--surface); border: 2px solid var(--accent);
  display: grid; place-items: center; overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.siggy-bubble__btn .siggy-art { width: 54px; height: 54px; }
.siggy-bubble__msg {
  display: none; max-width: 240px;
  background: var(--surface-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 12px 14px; font-size: 13.5px; font-weight: 500;
  box-shadow: var(--shadow-lg);
}
.siggy-bubble.is-open .siggy-bubble__msg { display: block; animation: popIn 240ms var(--ease-out) both; }

/* ---------- Bottom nav (mobile) ---------- */
.bottom-nav {
  display: none;
  border-top: 1px solid var(--border); background: var(--surface);
  grid-template-columns: repeat(5, 1fr);
  padding-bottom: env(safe-area-inset-bottom);
  z-index: 60;
}
.bottom-nav a, .bottom-nav button {
  display: grid; justify-items: center; align-content: center; gap: 3px;
  min-height: var(--bottomnav-h); padding: 8px 2px;
  color: var(--text-muted); font-size: 11px; font-weight: 600;
}
.bottom-nav svg { width: 22px; height: 22px; }
.bottom-nav a.is-active { color: var(--accent); }
.bottom-nav a:hover { text-decoration: none; color: var(--text-primary); }
.bottom-nav__siggy { width: 40px; height: 28px; overflow: hidden; display: grid; place-items: center; }
.bottom-nav__siggy svg { width: 34px; height: 34px; }

/* ---------- Screen layout helpers ---------- */
.dash-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); }
.lib-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(270px, 100%), 1fr)); gap: var(--space-4); }
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr)); gap: var(--space-4); }
.mastery-map { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 6px; }
.mastery-map.phrases { grid-template-columns: repeat(auto-fill, minmax(86px, 1fr)); }
.entry-card { display: flex; align-items: center; gap: var(--space-4); width: 100%; }
.entry-card > svg { width: 20px; height: 20px; margin-left: auto; color: var(--text-muted); flex: none; }
.entry-card__icon { width: 52px; height: 52px; border-radius: var(--radius-md); display: grid; place-items: center; flex: none; }
.entry-card__icon svg { width: 26px; height: 26px; }

/* ---------- Tablet 768–1023 ---------- */
@media (max-width: 1023px) {
  .app-main, .app-shell.no-siggy .app-main { grid-template-columns: 76px minmax(0, 1fr); }
  .siggy-panel { display: none; }
  .siggy-bubble { display: flex; bottom: 16px; }
  .sidebar__nav .nav-item { justify-content: center; padding: 12px 0; }
  .sidebar__nav .nav-item span, .sidebar__scroll, .sidebar__streak-wrap { display: none; }
  .topbar__nav { display: none; }
  .dash-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- Mobile ≤767 ---------- */
@media (max-width: 767px) {
  .app-shell { grid-template-rows: var(--topbar-h) 1fr auto; }
  .app-main, .app-shell.no-siggy .app-main { grid-template-columns: minmax(0, 1fr); }
  .sidebar { display: none; }
  .bottom-nav { display: grid; }
  .siggy-bubble { bottom: calc(var(--bottomnav-h) + 12px); }
  .main-inner { padding: var(--space-4) var(--space-4) var(--space-8); }
  .dash-grid { grid-template-columns: 1fr; }
  .dash-grid .card { grid-column: auto !important; }
  .hide-mobile { display: none !important; }
  .logo { font-size: 19px; }
  .topbar { gap: var(--space-2); padding: 0 var(--space-3); }
}


/* Keep grid children shrinkable so cards never force the shell wider than the viewport. */
.dash-grid > *, .lib-grid > *, .stats-row > *, .session-grid > * { min-width: 0; }

@media (min-width: 768px) and (max-width: 1279px) {
  .dash-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 767px) {
  /* On phones the bottom-nav Siggy tab is the trigger; no round bubble covering controls. */
  .siggy-bubble { left: 14px; right: 14px; pointer-events: none; align-items: stretch; }
  .siggy-bubble__btn { display: none; }
  .siggy-bubble__msg { pointer-events: auto; width: 100%; max-width: none; }
}

@media (max-width: 380px) {
  .topbar { gap: 8px; padding: 0 10px; }
  .logo { gap: 7px; font-size: 18px; }
  .logo__mark { width: 33px; height: 33px; }
  .streak-count { padding: 6px 9px; }
  .main-inner { padding-inline: 14px; }
}

.screen-enter { grid-template-columns: minmax(0, 1fr); }
.entry-card > span { min-width: 0; }